/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.thrift;

import static org.apache.hadoop.hbase.util.Bytes.getBytes;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.TreeMap;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Append;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
import org.apache.hadoop.hbase.client.Increment;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.io.compress.Compression;
import org.apache.hadoop.hbase.regionserver.BloomType;
import org.apache.hadoop.hbase.security.access.Permission;
import org.apache.hadoop.hbase.thrift.generated.ColumnDescriptor;
import org.apache.hadoop.hbase.thrift.generated.IllegalArgument;
import org.apache.hadoop.hbase.thrift.generated.TAppend;
import org.apache.hadoop.hbase.thrift.generated.TCell;
import org.apache.hadoop.hbase.thrift.generated.TColumn;
import org.apache.hadoop.hbase.thrift.generated.TIncrement;
import org.apache.hadoop.hbase.thrift.generated.TRowResult;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.yetus.audience.InterfaceAudience;

@InterfaceAudience.Private
public final class ThriftUtilities {
  private ThriftUtilities() {
  }

  /**
   * This utility method creates a new Hbase HColumnDescriptor object based on a Thrift
   * ColumnDescriptor "struct".
   * @param in Thrift ColumnDescriptor object
   * @throws IllegalArgument if the column name is empty
   */
  public static ColumnFamilyDescriptor colDescFromThrift(ColumnDescriptor in)
    throws IllegalArgument {
    Compression.Algorithm comp =
      Compression.getCompressionAlgorithmByName(in.compression.toLowerCase(Locale.ROOT));
    BloomType bt = BloomType.valueOf(in.bloomFilterType);

    if (in.name == null || !in.name.hasRemaining()) {
      throw new IllegalArgument("column name is empty");
    }
    byte[] parsedName = CellUtil.parseColumn(Bytes.getBytes(in.name))[0];
    return ColumnFamilyDescriptorBuilder.newBuilder(parsedName).setMaxVersions(in.maxVersions)
      .setCompressionType(comp).setInMemory(in.inMemory).setBlockCacheEnabled(in.blockCacheEnabled)
      .setTimeToLive(in.timeToLive > 0 ? in.timeToLive : Integer.MAX_VALUE).setBloomFilterType(bt)
      .build();
  }

  /**
   * This utility method creates a new Thrift ColumnDescriptor "struct" based on an Hbase
   * HColumnDescriptor object. Hbase HColumnDescriptor object
   * @return Thrift ColumnDescriptor
   */
  public static ColumnDescriptor colDescFromHbase(ColumnFamilyDescriptor in) {
    ColumnDescriptor col = new ColumnDescriptor();
    col.name = ByteBuffer.wrap(Bytes.add(in.getName(), KeyValue.COLUMN_FAMILY_DELIM_ARRAY));
    col.maxVersions = in.getMaxVersions();
    col.compression = in.getCompressionType().toString();
    col.inMemory = in.isInMemory();
    col.blockCacheEnabled = in.isBlockCacheEnabled();
    col.bloomFilterType = in.getBloomFilterType().toString();
    col.timeToLive = in.getTimeToLive();
    return col;
  }

  /**
   * This utility method creates a list of Thrift TCell "struct" based on an Hbase Cell object. The
   * empty list is returned if the input is null. Hbase Cell object
   * @return Thrift TCell array
   */
  public static List<TCell> cellFromHBase(Cell in) {
    List<TCell> list = new ArrayList<>(1);
    if (in != null) {
      list.add(new TCell(ByteBuffer.wrap(CellUtil.cloneValue(in)), in.getTimestamp()));
    }
    return list;
  }

  /**
   * This utility method creates a list of Thrift TCell "struct" based on an Hbase Cell array. The
   * empty list is returned if the input is null.
   * @param in Hbase Cell array
   * @return Thrift TCell array
   */
  public static List<TCell> cellFromHBase(Cell[] in) {
    List<TCell> list = null;
    if (in != null) {
      list = new ArrayList<>(in.length);
      for (int i = 0; i < in.length; i++) {
        list.add(new TCell(ByteBuffer.wrap(CellUtil.cloneValue(in[i])), in[i].getTimestamp()));
      }
    } else {
      list = new ArrayList<>(0);
    }
    return list;
  }

  /**
   * This utility method creates a list of Thrift TRowResult "struct" based on an Hbase RowResult
   * object. The empty list is returned if the input is null. Hbase RowResult object This boolean
   * dictates if row data is returned in a sorted order sortColumns = True will set TRowResult's
   * sortedColumns member which is an ArrayList of TColumn struct sortColumns = False will set
   * TRowResult's columns member which is a map of columnName and TCell struct
   * @return Thrift TRowResult array
   */
  public static List<TRowResult> rowResultFromHBase(Result[] in, boolean sortColumns) {
    List<TRowResult> results = new ArrayList<>(in.length);
    for (Result result_ : in) {
      if (result_ == null || result_.isEmpty()) {
        continue;
      }

      TRowResult result = new TRowResult();
      result.row = ByteBuffer.wrap(result_.getRow());

      if (sortColumns) {
        result.sortedColumns = new ArrayList<>();
        for (Cell kv : result_.rawCells()) {
          result.sortedColumns.add(new TColumn(
            ByteBuffer
              .wrap(CellUtil.makeColumn(CellUtil.cloneFamily(kv), CellUtil.cloneQualifier(kv))),
            new TCell(ByteBuffer.wrap(CellUtil.cloneValue(kv)), kv.getTimestamp())));
        }
      } else {
        result.columns = new TreeMap<>();
        for (Cell kv : result_.rawCells()) {
          result.columns.put(
            ByteBuffer
              .wrap(CellUtil.makeColumn(CellUtil.cloneFamily(kv), CellUtil.cloneQualifier(kv))),
            new TCell(ByteBuffer.wrap(CellUtil.cloneValue(kv)), kv.getTimestamp()));
        }
      }

      results.add(result);
    }

    return results;
  }

  /**
   * This utility method creates a list of Thrift TRowResult "struct" based on an array of Hbase
   * RowResult objects. The empty list is returned if the input is null. Array of Hbase RowResult
   * objects
   * @return Thrift TRowResult array
   */
  public static List<TRowResult> rowResultFromHBase(Result[] in) {
    return rowResultFromHBase(in, false);
  }

  public static List<TRowResult> rowResultFromHBase(Result in) {
    Result[] result = { in };
    return rowResultFromHBase(result);
  }

  /**
   * From a {@link TIncrement} create an {@link Increment}.
   * @param tincrement the Thrift version of an increment
   * @return an increment that the {@link TIncrement} represented.
   */
  public static Increment incrementFromThrift(TIncrement tincrement) {
    Increment inc = new Increment(tincrement.getRow());
    byte[][] famAndQf = CellUtil.parseColumn(tincrement.getColumn());

    if (famAndQf.length != 2) {
      return null;
    }

    inc.addColumn(famAndQf[0], famAndQf[1], tincrement.getAmmount());
    return inc;
  }

  /**
   * From a {@link TAppend} create an {@link Append}.
   * @param tappend the Thrift version of an append.
   * @return an increment that the {@link TAppend} represented.
   */
  public static Append appendFromThrift(TAppend tappend) {
    Append append = new Append(tappend.getRow());
    List<ByteBuffer> columns = tappend.getColumns();
    List<ByteBuffer> values = tappend.getValues();

    if (columns.size() != values.size()) {
      throw new IllegalArgumentException(
        "Sizes of columns and values in tappend object are not matching");
    }

    int length = columns.size();

    for (int i = 0; i < length; i++) {
      byte[][] famAndQf = CellUtil.parseColumn(getBytes(columns.get(i)));
      append.addColumn(famAndQf[0], famAndQf[1], getBytes(values.get(i)));
    }
    return append;
  }

  public static Permission.Action[] permissionActionsFromString(String permission_actions) {
    Set<Permission.Action> actions = new HashSet<>();
    for (char c : permission_actions.toCharArray()) {
      switch (c) {
        case 'R':
          actions.add(Permission.Action.READ);
          break;
        case 'W':
          actions.add(Permission.Action.WRITE);
          break;
        case 'C':
          actions.add(Permission.Action.CREATE);
          break;
        case 'X':
          actions.add(Permission.Action.EXEC);
          break;
        case 'A':
          actions.add(Permission.Action.ADMIN);
          break;
        default:
          break;
      }
    }
    return actions.toArray(new Permission.Action[0]);
  }
}
